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Old 02-24-2009, 10:58 AM   #1
Hikeon3
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Default Food grade plastics heated then cooled. STill food grade?

I couldn't find an easy answer for this so I figured I'd ask if anyone knows the chemistry/thermophysics behind this.

If a given plastic item I have is rated as being "Food Grade up to 180 degrees Farenheit", it is obviously because past that temperature point the material will start shedding chemicals into solution.

Well, does it retain its food-grade properties if it has been heated to above 180 degrees then returned to a lower temperature?

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